Spikes signed, and he doesn't really need to be catching passes from Brady anyways .

For all we know, they might have ranked him last in line for getting a contract done, since Gronk has been away from football for a year and needs to be there w/ Brady, and Cunningham needs every last minute that he can get for switching positions. They both have a steeper curve ahead of them than Spikes does, so that's a possible explanation. Bottom line, though, we just don't know and it's definitely not a big deal.